TORY grandees have been accused of orchestrating an EU referendum stitch-up after it was revealed the party’s favourite printers are making pro-Brussels publicity material.

The PM had demanded the Tory machine remain neutral in the EU referendum

Britain Stronger in Europe (BSE) – the business-led campaign for a vote to remain in the EU – are using the same print company, St Ives Plc, that made Conservative election leaflets.

The firm, which has a member of staff permanently based inside the Tories' London HQ, is churning out pro-EU propaganda for BSE.

Conservative Campaign Headquarters had pledged to remain neutral during the campaign – and the involvement of St Ives in the campaign has led some to accuse senior figures of “cheating”.

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The big money Britain Stronger in Europe campaign is led by Lord Rose

Eurosceptic Tory MP Steve Baker said: “It is beginning to look like someone is cheating rules which the PM wisely established to avoid rancour in our party."

BSE – led by former Marks and Spencer’s boss Lord Rose and Labour princeling Will Straw – has sent a deluge of unsolicited mailshots to unsuspecting householders claiming it would be a disaster should Britain leave the EU.

But the lobby group’s £1.5 million campaign leaflet is filled with errors and misinformation, according to Vote Leave campaigners.

They dispute BSE’s claims that quitting Brussels would put jobs at risk and that EU membership is worth £3,000 a year to the average British family.

A Vote Leave insider said: “The use of this printers looks particularly dodgy given the PM’s insistence the party machinery should remain neutral.”

Conservative HQ have also been accused of trying to gag anti-EU MPs in order to prevent them encouraging local activists to leave.

A party directive sent to constituency officers warned that MPs were not to be allowed to speak out in favour of Brexit without a pro-EU speaker also being present.

Rubbishing the “ridiculous” diktat, Gainsborough MP Sir Edward Leigh said: “It is clearly an absurd letter but I have to say that nobody is going to take a blind bit of notice.”

Neither BSE nor a spokesman for the Prime Minister would comment on the use of St Ives as printers for the campaign.